Genomic and clinical determinants of recurrence in localized clear cell renal cell carcinoma (ccRCC).

Abstract

664 Background: Multiple clinical risk scores and gene expression models have predicted recurrence in localized ccRCC. However, few studies explored genomic alterations (GA) predicting recurrence. Methods: We assessed genomic and clinical correlates of disease-free survival (DFS) in surgically treated localized ccRCC using a targeted next generation sequencing (NGS) platform (Oncopanel/PROFILE) and publicly available NGS and clinical data from TCGA. Univariable and stepwise multivariable Cox regression models (stratified by database) were performed. Results: 478 patients (123 patients from our institution and 355 patients from TCGA) were included. 150 (31.4%) patients experienced a DFS event (recurrence or death) and 94 (19.7%) died at 3.1 years (yrs) of median follow-up. Median DFS was 6.3 (5.4-7.2) yrs and the 5-yr overall survival rate was 70.8% (64.9-76.7). On multivariable analysis, 4 clinical factors and mutations in 3 genes were significantly associated with recurrence (Table). Conclusions: Our study suggests that PTEN, BAP1 and KDM5C GA may improve on clinical factors for prediction of localized ccRCC recurrence. Further work is needed to determine if these GA could improve existing validated risk models. [Table: see text]